Primer Carburetors; Plastic (White) Floats - Tecumseh SPECTRA 37 Service And Repair Manual

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Plastic (white) floats

If the carburettor is fitted with a white plastic float, the
distance 'L' (Fig 16) is pre-set and non adjustable. If this
setting is not correct, or float is damaged, a new float
must be fitted.
c) PRIMER CARBURETTORS
In the pre-start position, fuel fills the prime well in the
bowl nut to the level maintained by the float. This will provide
the rich mixture required to start a cold engine. It takes
about 5 seconds for the prime well to refill after each
starting attempt or when engine is stopped.
Push Pre-starting Primer 2 or 3 times. Pause about 2
seconds between each push.
NOTE - In cold weather (10C or below), push Pre-
starting Primer 5 times. Do NOT use pre-starting Primer
to re-start a warm engine which has stopped for a short
period.
If the engine is used in cool weather conditions, the primer
can be used to force fuel through the main nozzle to
provide a richer mixture.
When the engine starts and runs, the fuel level in the
bowl and prime well stabilizes and air from the air bleed
and fuel from the main jet are pulled up the main nozzle
for engine operation.
Index Fig. 17 - Before start
1. Felt seal
2. Internal vent
3. Air bleed
4. Prime charge
5. Fuel inlets
Index Fig. 18 - Prime
1. Primer bulb
2. Main jet
3. Main nozzle
Index Fig. 19 - Run
1. Throttle shutter
2. Internal vent
3. Air bleed
4. Fuel inlet
5. Main nozzle
6. Main jet
7. Fuel inlets
47
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Fig. 17
Fig. 18
Fig. 19